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USGS-authored or produced data and information are considered to be in the U.S. public domain. While the content of most USGS Web pages is in the U.S. public domain, not all information, illustrations, or photographs on our site are. Some non USGS photographs, images, and/or graphics that appear on USGS Web sites are used by the USGS with permission from the copyright holder. These materials are generally marked as being copyrighted. To use these copyrighted materials, you must obtain permission from the copyright holder under the copyright law.

When using information from USGS information products, publications, or Web sites, we ask that proper credit be given. Credit can be provided by including a citation such as the following:

Credit: U.S. Geological Survey
Department of the Interior/USGS
U.S. Geological Survey/photo by Jane Doe (if the photographer/artist is known)

Additional information on Acknowledging or Crediting USGS as Information Source is available.

Policy - For relevant USGS policy on copyrights and trademarks, refer to the Survey Manual chapter entitled, �Use of Copyrighted Material in USGS Information Products.�

Contact - If you have questions concerning the use of USGS information, contact the USGS Web.

USGS-authored or produced data and information are in the public domain. While the content of most USGS web pages is in the public domain, not all the information on our site is in the public domain. Some images/graphics are used by USGS with permission. For other uses, you may need to obtain permission from the copyright holder under the copyright law.

You are welcome to make a link to any of the Web pages USGS has published on the Internet. There is no need to request permission.

Use of the USGS visual identifier (logo) is restricted to official publications.

We will identify material we use from sources outside of USGS, and request others do the same when using information published by USGS. Credit can be provided by including on the page (or via a link to a credits page) a citation such as:

Credit: U. S. Geological Survey
U. S. Geological Survey/photo by Jane Doe (if the artist is known)
USGS/Ft. Collins, CO (if originating office but not the artist is known)